[Spamassassin Wiki] Update of "Rules/MSGID MULTIPLE AT" by LeeMaguire

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The following page has been changed by LeeMaguire:
http://wiki.apache.org/spamassassin/Rules/MSGID_MULTIPLE_AT

The comment on the change is:
update note per RFC5322 regarding quoted string

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  [https://issues.apache.org/SpamAssassin/show_bug.cgi?id=5707 Bug #5707] suggests that ''Microsoft Office Outlook 12.0'' (a.k.a [http://support.microsoft.com/ph/11335 Office Outlook 2007]) generates invalid Message-Id fields, triggering this rule.
  
- ''Note:'' Since ''{{{dot-atom-text}}}'' does not include the @ symbol, multiple instances usually indicate an invalid Message-Id.  However it is possible for a syntactically valid (per RFC2822) Message-Id field to contain multiple "@" symbols under the circumstances that the ''{{{id-left}}}'' component consists of a double-quoted string (where ''{{{qtext}}}'' can contain ''{{{%d64}}}'', allowing the "wrapping" of Message-Id fields) or inside ''{{{id-right}}}'' as part of a literal address string. For example:
+ ''Note:'' Since ''{{{dot-atom-text}}}'' does not include the @ symbol, multiple instances usually indicate an invalid Message-Id.  However it is possible for a syntactically valid (per RFC2822) Message-Id field to contain multiple "@" symbols under the circumstances that the ''{{{id-left}}}'' component consists of a double-quoted string (where ''{{{qtext}}}'' can contain ''{{{%d64}}}'', although this format is now marked as obsolete by RFC5322) or inside ''{{{id-right}}}'' as part of a literal address string. For example:
    {{{Message-Id: <"1...@host.example.com>
  Message-Id: <12345@[123@456]>
  Message-Id: <"12345@example.org"@[123@456]>}}}